Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
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Numerical taxonomic study of the genus Sorbaria (Ser.) A. Braun in Asch. (Rosaceae)

쉬땅나무속(장미과)의 수리분류학적 연구

  • SONG, Jun-Ho (Laboratory of Plant Systematics, Department of Biology, Kyung Hee University) ;
  • HONG, Suk-Pyo (Laboratory of Plant Systematics, Department of Biology, Kyung Hee University)
  • 송준호 (경희대학교이과대학생물학과) ;
  • 홍석표 (경희대학교이과대학생물학과)
  • Received : 2018.04.04
  • Accepted : 2018.06.16
  • Published : 2018.09.30
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Abstract

We conducted principal component analyses using the quantitative characteristics of the genus Sorbaria to investigate and explore morphological variation and diagnostic characteristics. The genus Sorbaria was divided into two groups based on erect or pendulous inflorescence, the existence of hairs on the ovary and follicle surfaces, the number of stamens, and the shape of the sepal. As a result of our investigation and of a morphometric analysis, these two groups could be also classified using quantitative characteristics, in this case the number of leaflets, the size of the leaflets, the width of the inflorescence, the size of the sepal, the petal, and the follicles and seeds. In the Sorbifolia group (S. grandiflora and S. sorbifolia complex), the size of lateral leaflets, number of veins, gland and stellate density on the abaxial surface of leaflets, and the petal and follicle size were found to be useful identification characteristics. The terminal and lateral leaflet size and the gland and stellate density on the abaxial surface of the leaflets were found to be characters of taxonomic value for the Kirilowii group (S. arborea complex, S. kirilowii, and S. tomentosa complex). The results of the numerical analysis conducted here can provide valuable information to those reconsidering and delimiting a taxonomic revision of the genus Sorbaria.

쉬땅나무속 분류군의 형태적 변이를 파악하고, 각 분류군의 식별형질을 검토하기 위해 정량적 형질을 이용하여 주성분분석(principal component analysis)을 수행하였다. 쉬땅나무속 분류군은 화서의 직립여부, 자방 및 골돌과 표면의 털 유무, 수술의 개수, 악편의 형태 등의 정성적 형질로 크게 두 그룹으로 구분된다. 본 연구 결과, 소엽의 개수 및 크기, 화서의 너비, 악편, 화판, 골돌과, 종자의 크기 등의 정량적 형질 또한 이들 두 그룹으로 뚜렷하게 구분되었다. 그룹 내에서는 Sorbifolia group (S. grandiflora, S. sorbifolia complex)의 경우, 측소엽의 크기와 엽맥의 수, 소엽 하면 내 선점 및 성상모의 개수, 화판, 골돌과의 크기 등의 형질이 유용한 식별형질로 파악되었으며, Kirilowii group (S. arborea complex, S. kirilowii, S. tomentosa complex) 내에서는 잎의 형질 중 정소엽과 측소엽의 크기 및 하면의 선점 및 성상모의 빈도 등이 분류군을 인식하는 데 유용한 것으로 파악되었다. 본 속의 수리분류학적 연구 결과는 추후 종 하 분류군을 포함한 쉬땅나무속 전체의 분류학적 재검토 및 분류학적 한계 설정에 매우 유용할 것으로 판단된다.

Keywords

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